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  • Otosclerosis  (2)
  • 79.20  (1)
  • Freeze-etch  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Si etching affected by ir laser irradiation (1985)
    Springer
    Applied physics 37 (1985), S. 117-119 
    Details
    ISSN: 1432-0630
    Keywords: 82.50 ; 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Silicon was etched in an aqueous solution of sodium hydroxide under ir laser irradiation. Two types of lasers were used, a Nd:YAG laser with a wavelength of λ=1.06 μm and a CO2 laser with λ=10.6 μm. Small-size blind holes, through holes and reliefs were formed on a Si target, and even a special type of hole can be formed with help of a CO2 laser, namely a blind hole with a hillock in its center.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618861
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    X-ray and dissolution studies of paramylon storage granules fromEuglena (1988)
    Springer
    Protoplasma 146 (1988), S. 150-156 
    Details
    ISSN: 1615-6102
    Keywords: β-1,3 Glucan ; Euglena ; Freeze-etch ; Microfibril ; Paramylon ; X-ray diffraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Paramylon is the β-1,3 glucan storage carbohydrate in the euglenoid algae. Mature paramylon granules are highly crystalline, fibrillar, and have a complex substructure. X-ray diffraction was used to demonstrate that mature paramylon granules are much more crystalline than immature granules. Freeze-etch electron microscopy showed that in mature granules, the microfibrils are organized in highly ordered arrays while the microfibrils of immature granules are less organized. The data suggest that the high crystallinity of paramylon is due to higher-order aggregates of microfibrils and the interaction of water with the microfibrils. The dissolution of paramylon was recorded by darkfield videomicroscopy. In a 0.5 N NaOH solution, paramylon dissociates in a regular manner into its constituent 4 nm microfibrils, and the central region of the granule is the last remaining refractile area during the dissolution process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01405924
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Cathepsin-B activity in otosclerosis (1983)
    Springer
    European archives of oto-rhino-laryngology and head & neck 238 (1983), S. 123-125 
    Details
    ISSN: 1434-4726
    Keywords: Otosclerosis ; Stapes footplate ; Cathepsin B
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cathepsin-B activity was determined fluorimetrically in the otosclerotic stapes footplate, the stapes superstructure, normal temporal cortical bone, and os frontale osteoma. Measurements with a synthetic substrate made determinations in individual samples possible. The cathepsin-B activity in the otosclerotic stapes footplate was one order of magnitude higher than that of the superstructure, which was not affected by the disease. The cortical bone and the superstructure displayed similar activities, as did os frontale osteoma and otosclerosis. The high lysosomal proteinase activity appears to be closely connected to the otosclerotic bone resorption process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00454303
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Inhibition of myosin light-chain kinase activity in the organ of Corti by 0.3–5 kilodalton substances of the otosclerotic perilymph (1986)
    Springer
    European archives of oto-rhino-laryngology and head & neck 243 (1986), S. 229-232 
    Details
    ISSN: 1434-4726
    Keywords: Myosin kinase ; Otosclerosis ; Perilymph ; Organ of Corti
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The guinea pig organ of Corti contains myosin light-chain kinase (MLCK) activity. The upper and lowermost parts of the cochlea do not show significantly different activities of the enzyme, which is Ca2+ and calmodulin-dependent. Short-term noise exposure does not cause a significant change. 0.3–5 Kilodalton substances of the otosclerotic perilymph, separated by SG-25 column chromatography, inhibit the MLCK activity in in vitro organ of Corti preparations. This inhibitory action of the perilymph substances can also be observed with the purified MLCK of turkey gizzard. The activity of the enzyme can be specifically inhibited by cyclic AMP-dependent protein kinase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00464435
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    Paper (German National Licenses)
    Fulltext
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